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mtsdw
Measure the a-c of the suspension fork, preferably while sagged.
If you can't measure it while sagged, measure it fully extended and then subtract 25-30% of the total travel.
Bear in mind that the frame will be designed to work within the range of travel, so if you get a rigid fork with slightly less a-c (but not less than the suspension fork fully compressed), it should still steer within the boundaries of acceptability.